The condenser needs to adjust the size of the water flow according to the circulating water temperature so as to control the exhaust steam of the steam turbine. Therefore, the circulating water pump is not always in a full-load working condition. The pressure, traffic has a certain margin. The pump shaft power is proportional to the cube of its speed. So the speed slightly lower the power that is more substantial decline. In more than one pump, such as one of the use of frequency converter adjustment, according to changes in temperature and load at any time to adjust the water flow to achieve energy-saving purposes. Circulating pump motor power 185kW. Hitachi i300 series configuration 2200HF inverter, taking into account the motor soft-start longer, so as a long-term operation of the pump, the design of spare pump self-cast circuit and alarm loop. Select inverter fault alarm output contact AL0, AL1, as the backup pump since the vote contact, due to the smaller contact capacity. DC DC voltage is low (AC250V, 0.2A, DC30V, 0.6A inductive load), so in the output port of a DZ-52/40 type relay ZJ, to solve the contact capacity of small and insufficient number of issues. ZJ's three mating contacts are respectively connected to the movable contact of BCJ of three standby pump outlet protection relays. When the inverter trips due to overcurrent, overvoltage, overload and other reasons, the AL contact of the inverter is closed, the closed contact of the ZJ relay and the BK contact of the interlock switch form a closed loop, and the standby pump switches on. The access method "quick break" light plate will not fall out of cards, to distinguish "quick break" current relay trip. Ruoyin inverter operation instructions, the frequency command input circuit break or control switch, potentiometer damage and make the inverter interrupt output, such fault inverter can not be identified. The solution is: choose a piece of input signal is DC0-1OV, corresponds to display 0 ~ 50 with switch output intelligent display instrument as a remote monitoring instrument (frequency table), normal operation as a frequency monitor. Using the switch (LW5-15 / B4815 / 5) contacts (11) - (12) of the original control motor as the input switch of inverter operation instruction, contact (17) - (18), 20) concatenated with the lower limit alarm relay alarm ALM and thermal flashing alarm. When the inverter interrupts the output due to the above reasons, the alarm will sound and light when the frequency drops to 5Hz (settable). At the moment of closing, although the inverter frequency is lower than 5Hz, the lower limit alarm relay ALM of the frequency meter is closed, but the contacts (19) - (20) of the switch are not closed yet and the thermal flashing alarm will not send an alarm signal. If the original fault due to the inverter or motor failure of the original circuit breaker, zero sequence protection action, the protection of the export relay BCJ can also be self-spare pump. Light words still send a signal. So that the original circuit breaker relay protection and the newly installed inverter protection device integration. No matter what happens, can cast a backup pump or sound and light signals, so that energy-saving operation and safe operation of both correct. Oxide powder for thermal spray refers to a type of powder material that is used in thermal spray processes. Thermal spray is a coating technique where a material in powder form is heated and propelled onto a substrate, forming a coating. Oxide Ceramics Powder,Pure Aluminum Oxide Powder,Chromium Oxide Ceramics Powder,Yttria Stabilized Zirconia Powder Luoyang Golden Egret Geotools Co., Ltd , https://www.xtcalloypowder.com
Oxide powders are commonly used in thermal spray applications due to their high melting points, excellent wear resistance, and thermal insulation properties. They can be used to create protective coatings on various surfaces, such as metals, ceramics, and plastics.
Some common types of oxide powders used in thermal spray include:
1. Aluminum oxide (Al2O3): This oxide powder is widely used for its high hardness, wear resistance, and thermal insulation properties. It is commonly used for coating applications in industries such as aerospace, automotive, and electronics.
2. Zirconium oxide (ZrO2): Zirconium oxide powder is known for its high melting point and excellent thermal barrier properties. It is often used in thermal spray coatings for gas turbine engine components, where thermal insulation is critical.
3. Chromium oxide (Cr2O3): Chromium oxide powder is used for its high hardness, corrosion resistance, and wear resistance. It is commonly used in applications where high temperature and abrasive wear resistance are required.
4. Titanium oxide (TiO2): Titanium oxide powder is known for its high refractive index and excellent UV resistance. It is often used in thermal spray coatings for optical and decorative applications.
These oxide powders can be applied using various thermal spray techniques, such as flame spraying, plasma spraying, or high-velocity oxy-fuel (HVOF) spraying. The choice of oxide powder and thermal spray technique depends on the specific application requirements and desired coating properties.